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On using 3D γ‐analysis for IMRT and VMAT pretreatment plan QA
Author(s) -
Wu Chuan,
Hosier Kelly E.,
Beck Kristen E.,
Radevic Marlyn B.,
Lehmann Joerg,
Zhang Hao H.,
Kroner Aaron,
Dutton Sharon C.,
Rosenthal Seth A.,
Bareng Jonathan K.,
Logsdon Mark D.,
Asche David R.
Publication year - 2012
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.4711755
Subject(s) - nuclear medicine , image guided radiation therapy , projection (relational algebra) , medicine , medical physics , computer science , medical imaging , radiology , algorithm
Purpose: To investigate using 3D γ analysis for IMRT and VMAT QA.Methods: We explored and studied 3D γ‐analysis by comparing TPS computed and EPID back‐projection reconstructed doses in patient's CT images. Two 3D γ quantities, γ PTV and γ 10 , were proposed and studied for evaluating the QA results, and compared to 2D γ (MapCheck composite: γ MC ).Results: It was found that when 3%(global)/3 mm criteria was used, all IMRT and 90% of VMAT plans passed QA with a γ pass rate ≥90%. A significant statistical correlation was observed between 3D and 2D γ‐analysis results for IMRT QA if γ 10 and γ MC are concerned, but no significant relation is found between γ PTV and γ MC .Conclusions: 3D γ analysis based on EPID dose back‐projection may provide a feasible tool for IMRT and VMAT pretreatment plan QA.